Bump docker/build-push-action from 3 to 6 (#295)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 3 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v3...v6)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -33,7 +33,7 @@ jobs:
       -
         name: Build and push Postgres 15
         id: docker_build_15
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           build-args: |
             PG_VERSION=15.10
@@ -48,7 +48,7 @@ jobs:
       -
         name: Build and push Postgres 15 Timescale DB
         id: docker_build_15_timescaledb
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           build-args: |
             PG_VERSION=15.10
@@ -64,7 +64,7 @@ jobs:
       -
         name: Build and push Postgres 16
         id: docker_build_16
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           build-args: |
             PG_VERSION=16.6
@@ -79,7 +79,7 @@ jobs:
       -
         name: Build and push Postgres 16 Timescale DB
         id: docker_build_16_timescaledb
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           build-args: |
             PG_VERSION=16.6
@@ -95,7 +95,7 @@ jobs:
       -
         name: Build and push Postgres 17
         id: docker_build_17
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           build-args: |
             PG_VERSION=17.2
@@ -110,7 +110,7 @@ jobs:
       -
         name: Build and push Postgres 17 Timescale DB
         id: docker_build_17_timescaledb
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           build-args: |
             PG_VERSION=17.2